Feature: Add Gitpod or Stackblitz button to README

[lindsaykwardell]

Is your feature request related to a problem? Please describe.

As a new or returning contributor, I may not want to pull the repo down to my local machine in order to validate a change before submitting a PR. Having a button that opens the project in a sandbox environment such as Gitpod or Stackblitz would make contributing possible purely through the browser, and wouldn't require pulling anything to a local machine.

Describe the solution you'd like

Add a button to the root README that opens this repository in something like Gitpod or Stackblitz.

Describe alternatives you've considered

The alternative would be to continue recommending a full local clone of the project. Doing this is fine, but having the flexibility to set something up in the browser/cloud would be an additional help to folks wanting to contribute.

Additional context

Here's an example of the Gitpod button:

Source: https://github.com/lindsaykwardell/vite-elm-template

Article by Gitpod about adding such a button.

[dustinsgoodman]

This is a great idea. We're definitely going to look into implementing this because we want the contributor flow to be as seamless as possible.